HD 23277

HD 23277 (HR 1138) is a spectroscopic binary^[11] located in the northern circumpolar constellation Camelopardalis. With a combined apparent magnitude of 5.39,^[2] it is faintly visible to the naked eye under ideal conditions. This star is located at a distance of 372 light years,^[1] but is drifting away at a rate of 17 km/s.^[5]

HD 23277

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Camelopardalis
Right ascension	03h 49m 13.7393s[1]
Declination	+70° 52′ 15.781″[1]
Apparent magnitude (V)	5.391 ± 0.009[2]
Characteristics
Spectral type	kA2hA6VmA7[3]
U−B color index	+0.12[4]
B−V color index	+0.09[4]
Astrometry
Radial velocity (Rv)	17 ± 0.9[5] km/s
Proper motion (μ)	RA: 21.451(45) mas/yr[1] Dec.: −62.431(55) mas/yr[1]
Parallax (π)	8.7759 ± 0.0632 mas[1]
Distance	372 ± 3 ly (113.9 ± 0.8 pc)
Absolute magnitude (MV)	+0.11
Orbit[6]
Primary	HD 23277 A
Companion	HD 23277 B
Period (P)	15.5132 d
Semi-major axis (a)	43.0229 AU
Eccentricity (e)	0.2210
Argument of periastron (ω) (secondary)	287.41°
Argument of periastron (ω) (primary)	107.41°
Semi-amplitude (K1) (primary)	22.20 km/s
Semi-amplitude (K2) (secondary)	24.69 km/s
Details
A
Mass	2.38 ± 0.13[7] M☉
Radius	3.55+0.16 −0.24[7] R☉
Luminosity	59.7[8] L☉
Surface gravity (log g)	3.72 ± 0.08[7] cgs
Temperature	8,317+194 −189[7] K
Rotational velocity (v sin i)	25 ± 5[9] km/s
Age	610[10] Myr
B
Mass	2.11[6] M☉
Rotational velocity (v sin i)	25 ± 5[9] km/s
Other designations
BD+70°257, HD 23277, HIP 17854, HR 1138, SAO 5000
Database references
SIMBAD	data

The primary has a classification of kA2hA6VmA7,^[3] which indicates that it has the calcium K-line of an A2 star, but its hydrogen lines suggest a class of A6 V and metallic lines of an A7 star. At present it has 2.38 times the Sun's mass, and 3.55 times its radius.^[7] It radiates at 59.7 times the luminosity of the Sun^[8] from its photosphere at an effective temperature of 8,317 K,^[7] which gives it a white hue. The companion has 2.11 times the Sun's mass,^[6] which suggests it is an A-type main-sequence star like the primary. Both stars spin at a projected rotational velocity of 25 km/s, common for an Am star.^[9]

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
3. Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049.
4. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
5. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
6. Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars". Bulletin d'Information du Centre de Donnees Stellaires. 19: 71. Bibcode:1980BICDS..19...71K. ISSN 1169-8837.
7. Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361.
8. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (October 2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. ISSN 0035-8711.
9. Howe, K. S.; Clarke, C. J. (January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society. 392 (1): 448–454. Bibcode:2009MNRAS.392..448H. doi:10.1111/j.1365-2966.2008.14073.x. ISSN 0035-8711.
10. "Digital Demo Room - Stellar Structure and Evolution Simulator". rainman.astro.illinois.edu. Retrieved 30 December 2021.
11. Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (September 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424: 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. ISSN 0004-6361.